Palettizer/src/Importer.cs

using System.IO;
using System.Text.Json;
using System.Text.Json.Serialization;

namespace Palettizer
{
    public static class Importer
    {
        static JsonSerializerOptions options = new JsonSerializerOptions
        {
            PropertyNameCaseInsensitive = true,
            AllowTrailingCommas = true
        };

        static Importer()
        {
            options.Converters.Add(new JsonStringEnumConverter());
        }

        public static GMProject ImportProject(FileInfo projectFile)
        {
            return ImportResource<GMProject>(projectFile);
        }

        public static GMSprite ImportSprite(FileInfo soundFile)
        {
            return ImportResource<GMSprite>(soundFile);
        }

        private static T ImportResource<T>(FileInfo resourceFile)
        {
            return JsonSerializer.Deserialize<T>(File.ReadAllText(resourceFile.FullName), options);
        }
    }
}